Curl-resistant printing sheet for labels and tags

A durable sheet adapted for use as a label which does not curl when heated to temperatures normally encountered in laser or thermal transfer printing, the sheet including at least three layers comprised of:

• layer A, which consists essentially of at least one base layer consisting of comprising a paper, a synthetic paper or a coated film;
• layer B, which consists essentially of at least one print receiving layer consisting of a paper, a synthetic paper or a coated film, wherein layer B is adhered to the top face of layer A;
• and
• layer C, which consists essentially of at least one backing layer consisting of a paper, a synthetic paper or a coated film, wherein layer C is adhered to the bottom face of layer A;
• and wherein
• layer B and layer C have the same or substantially the same thermal elongation or contraction characteristics;
• and wherein
• the top surface of layer C comprises a release agent, the bottom surface of layer A comprises a pressure sensitive adhesive and layer B is permanently adhered to layer A.

A durable sheet for labels or tags which does not curl when heated to temperatures normally encountered in laser or thermal transfer printing, the sheet including at least three layers comprised of:

• layer A, which consists essentially of at least one base layer consisting of comprising a paper, a synthetic paper or a coated film;
• layer B, which consists essentially of at least one print receiving layer consisting of a paper, a synthetic paper or a coated film, wherein layer B is adhered to the top face of layer A;
• and
• layer C, which consists essentially of at least one backing layer consisting of a paper, a synthetic paper or a coated film, wherein layer C is adhered to the bottom face of layer A,
• and wherein layer B and layer C have the same or substantially the same thermal elongation or contraction characteristics;
• and wherein
• layer A comprises a thermoplastic resin, and layer B and layer C comprise a polyolefin.

A durable sheet for labels or tags which does not curl when heated to temperatures normally encountered in laser or thermal transfer printing, the sheet including at least three layers comprised of:

• layer A, which consists essentially of at least one base layer consisting of comprising a paper, a synthetic paper or a coated film;
• layer B, which consists essentially of at least one print receiving layer consisting of a paper, a synthetic paper or a coated film, wherein layer B is adhered to the top face of layer A;
• and
• layer C, which consists essentially of at least one backing layer consisting of a paper, a synthetic paper or a coated film, wherein layer C is adhered to the bottom face of layer A,
• and wherein layer B and layer C have the same or substantially the same thermal elongation or contraction characteristics;
• and wherein layer A comprises a thermoplastic polyester, layer B comprises a polyolefin and layer C comprises a thermoplastic resin coating.

A durable sheet for labels or tags which does not curl when heated to temperatures normally encountered in laser or thermal transfer printing, the sheet including at least three layers comprised of:

• layer A, which consists essentially of at least one base layer consisting of comprising a paper, a synthetic paper or a coated film;
• layer B, which consists essentially of at least one print receiving layer consisting of a paper, a synthetic paper or a coated film, wherein layer B is adhered to the top face of layer A;
• and
• layer C, which consists essentially of at least one backing layer consisting of a paper, a synthetic paper or a coated film, wherein layer C is adhered to the bottom face of layer A,
• and wherein layer B and layer C have the same or substantially the same thermal elongation or contraction characteristics;
• and which also includes a laser printing enhancing coating on the print receiving face of layer B.

A composite pressure sensitive label sheet which does not curl when heated to temperatures normally encountered in laser printing, said label sheet including at least three layers comprised of:

• layer A, which consists essentially of at least one base layer consisting of a tear resistant synthetic paper having a pressure sensitive adhesive on the bottom face thereof;
• layer B, which consists essentially of a print receiving tear resistant synthetic paper layer permanently adhered to the top face of layer A;
• and
• layer C, which consists essentially of a protective backing consisting of a paper layer or coated film releasably adhered to said pressure sensitive adhesive on the bottom face of layer A, said layer B and said layer C having the same or substantially the same thermal elongation or contraction characteristics.

A curl-free laser printed label sheet including at least three layers comprised of:

• layer A, which consists essentially of at least one base layer consisting of a tear resistant synthetic paper having a pressure sensitive adhesive on the bottom face thereof;
• layer B, which consists essentially of a laser printed tear resistant synthetic paper layer permanently adhered to the top face of layer A;
• and
• layer C, which consists essentially of a protective backing consisting of a paper layer or a coated film releasably adhered to said pressure sensitive adhesive on the bottom face of layer A, said layer B and said layer C having the same or substantially the same thermal elongation or contraction characteristics.